Reported wind and gusts wrong



  • The reported data is different to the met Eirann reported data.

    I'm noticing that windfinder is wrong too so the data source must be the issue.


  • Sailor

    @markdj
    That’s really weird because on Windy I see only Reported wind.
    You said « Windy reported the wind as 34-44.7 knots ». So where did you find Reported gust at 44.7kt ?

    On MACE HEAD, on Windy, there are no gusts in the meteo observations, only wind:

    4C8465E8-1F29-4A62-AC52-52E81920ACF7.jpeg

    As explained by @Gkikas-LGPZ, what you see in the weather picker are just forecasted figures.



  • I'm aware the weather picker is for forecasts.

    I'm just going by the 2 speeds shown in the graph (not forecast section). There are 2 speeds shown one on top of each other. Isn't that wind speed and gust?





  • Oh, that is confusing. The website showed it was forecast to the right of the current time and reported to the left but I'm not seeing the same interface as you.

    So then the main issue now seems to be that there is no reported wind gusts.



  • @markdj
    Reported wind gusts are shown.
    Forecasted, no.

    fae91b8b-b340-415e-bd09-64aeaf37ce90-εικόνα.png


  • Sailor

    @Gkikas-LGPZ
    @markdj

    Yes, on Windy, some Weather Stations show reported gusts, some show only wind.
    Concerning precisely MACE HEAD weather station there is no reported gusts shown by Windy.
    The interface you should see is this one:

    CC843A2B-D7BD-4EDB-9982-8CEEB8191B3B.jpeg

    In the other case, it should be interesting that you post here a screenshot of what you see.

    I have compared the reported wind, temperature and pressure at MACE HEAD WS at 8:00. The figures are the same, except for wind :
    9kt for 10kt reported on Windy.... due to rounding?

    C8306AE6-5118-47BA-93FF-247A91C68C5B.jpeg



  • @idefix37
    Wind gusts are not reported all the time from observing meteo. stations.
    There are some interational criteria for that,
    but also there are national deviations from the global regulations.

    For aviation purposes, wind gust is reported when the value is ten knots or more
    from the average.
    Thus, for wind 12 kts with gusts 21 kts , gusts not reported.
    for wind 12 kts with gusts 22 kts (or more) , gusts reported.



  • @idefix37
    Yes. 10kt instead 9 kt is due to rounding.

    My explanation:

    Mace head is not an airport, reporting in METAR format (wind in Kts).
    It reports in SYNOP format https://en.wikipedia.org/wiki/SYNOP
    and reports wind speed in m/sec

    I read the 08Z SYNOP from Mace head and it is
    03963 45764 /2405 10077 20053 30208 40237 52020 85/// ......

    the code /2405 means wind from 240 degrees at 5m/sec.
    Aprox. 1m/sec=2kts, so 5m/s=10kt


  • Sailor

    @Gkikas-LGPZ

    That confirms my thought, by rounding the calculation to transform m/s to kt.
    The subject of this topic was « Reported wind (and gusts) wrong ». I shall check again if Reported wind is so different on Windy and on Met Eireann as said @markdj. Gusts... we know that we can forget them in this comparison.



  • Thank you for your replies. I see there is a new interface and a new Windy app update came to me this morning that shows gusts for a few stations, but not for Mace Head and others. I think it would be great if wind gusts could be included even if there is a less than 10 knot difference as for mariners, I feel this makes a difference in sea state and it is just nice to see a maximum wind gust in the 60 knot range as it was on Friday morning.

    Thanks for your help, I'll be checking out this new interface today.


  • Sailor

    @markdj said in [Reported wind and gusts wrong]

    I think it would be great if wind gusts could be included even if there is a less than 10 knot difference as for mariners, I feel this makes a difference in sea state

    Gusts are not considered to have an effect on sea state, as the avg. wind is doing.
    In their inshore advisories the MetOffice do not give any gust forecast. In same type of advisories, Meteo France mention only gusts exceeding the wind from 10kt.
    Gusts + 10kt to +15kt
    Strong gusts +15kt to +25kt
    Violent gusts +25kt
    Gusts are important information for sail dinghies and light sail cruisers.
    For the sea state you can take into account the wind force, only (average wind/10min.), in official marine advisories and additionally with the Wind layer on Windy.
    But gust forecast is an important information on the land for the risks of damages they do.



  • yeah, I was thinking specifically about sailing yachts where a gust could blow out a spinnaker etc.


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